Are there any performance metric tools/scripts available in openstack ?
If not, how can I do the performance analysis of the above metrics on
openstack quantum setup ? Please help me regarding performance metrics.

I want to know details of the biggest deployment with
[openstack,Qauntum,openvswitch] setup interms of number of tenant networks,
number of compute nodes, number of VMs per tenant.

Most of the folks I know using Quantum are commercial companies, and I
suspect they may consider information about their current cloud scale to be
proprietary.

However, perhaps someone else on the list would be able to volunteer some
info on this.